Loudspeaker

ABSTRACT

In a loudspeaker including a diaphragm, a driver unit for driving said diaphragm and a frame for supporting said diaphragm and driver unit, said frame including arms for supporting said driver unit and a flange portion integrally formed with said arms, said flange portion being formed at its inner periphery in such shape as to conform to the outer periphery of the diaphragm and at its outer periphery in such dimension and shape as to substantially fit in a cabinet to which said frame is to be fixed, whereby the loudspeaker can be mounted in the cabinet without using a baffle board.

United States Patent Yoshio Ohashi Fukuroi-shi, Japan 823,833 May 12,1969 Jan. 12, 1971 Nippon Gakki Seizo Kabushiki Kaisha Ham amatsu-shiShizuoka-ken, Japan [72] Inventor [21 App]. No. [22] Filed [45] Patented[73] Assignee [32] Priority May 21, 1968 J p [54] LOUDSPEAKER 1 Claim, 4Drawing Figs.

Primary Examiner-Stephen J. Tomsky Attorney-Stevens, Davis, Miller &Mosher ABSTRACT: In a loudspeaker including a diaphragm, a driver unitfor driving said diaphragm and a frame for supporting said diaphragm anddriver unit, said frame including arms for supporting said driver unitand a flange portion integrally formed with said arms, said flangeportion being formed at its inner periphery in such shape as to conformto the outer periphery of the diaphragm and at its outer periphery insuch dimension and shape as to substantially fit in a cabinet to whichsaid frame is to be fixed, whereby the loudspeaker can be mounted in thecabinet without using a baffle board.

PATENTEI] JAN 1 2 |97I 1554315 sum 1 OF 2 PRIOR ART PRIOR ART INVENTORyou/m alum/l ATTORNEY 5 PATENTED JAN 1 2 l97| SHEET 2 0F 2 INVENTORyaw/0 011mm ATTORNEYS BACKGROUND OF THE INVENTION The present inventionrelates to a loudspeaker for electronic musical instruments or the like.

A loudspeaker radiates sonic waves at its front and rear sides inopposite phases with each other, and, therefore, it is necessary toprovide a baffle board in order to prevent the sonic waves at the frontand rear sides from interfering with each other when reproducing soundshaving long wavelength or low frequency.

FIGS. 1 and 2 show a conventional loudspeaker and a cabinet,respectively. As shown in FIGS. 1 and 2, the conventional loudspeakercomprises a diaphragm 2, a driver unit 13 for driving said diaphragm anda frame 1 which is formed at its outer periphery in such a shape as tosubstantially conform to the peripheral shape of said diaphragm, exceptflange portions 3 for mounting the frame in a cabinet. The loudspeakeris mounted in a cabinet 4, as shown in FIG. 2, through a baffle board 5fixed to the cabinet. In a loudspeaker system having a woofer and atweeter or more loudspeakers, those loudspeakers are mounted inapertures 14 formed in the baffle board 5, respectively.

It will be understood from the above explanation that in a conventionalconstruction of a loudspeaker an outer periphery of a frame does notconform to the inside of a cabinet to which said frame is to beattached, and consequently it is necessary to provide a baffle board formounting the frame of the loudspeaker.

I SUMMARY OF THE INVENTION It is an object of the present invention toprovide a loudspeaker which can be mounted on a cabinet without using abaffle board.

It is another object of the present invention to provide a loudspeakerwhich can be easily fabricated into a loudspeaker system.

It is a further object of the present invention to provide a loudspeakersystem which can be manufactured economically.

In accordance with the present invention there is provided a loudspeakerincluding a diaphragm, a driver unit for driving said diaphragm and aframe for supporting said diaphragm and driver unit, said frameincluding arms for supporting said driver unit and a flange portionintegrally formed with said arms, said flange portion being formed atits inner periphery in such shape as to conform to the outer peripheryof the diaphragm and at its outer periphery in such dimension and shapeas to substantially fit in a cabinet to which said frame is to beattached, whereby the loudspeaker can be mounted in the cabinet withoutusing a baffle board.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show a construction ofthe conventional loudspeaker, in which:

FIG. 1 is a front view of the loudspeaker; and

FIG. 2 is a perspective view of a cabinet and loudspeakers beforemounting.

FIGS. 3 and 4 show an embodiment of the loudspeaker according to thepresent invention, in which:

FIG. 3 is a front view of the loudspeaker; and

FIG. 4 is a perspective view of a cabinet and the loudspeaker as shownin FIG. 3, before mounting.

PREFERRED EMBODIMENT OF THE INVENTION Referring to FIGS. 3 and 4illustrating an embodiment of the present invention, the loudspeaker Itcomprises a frame 6, a diaphragm 7 and a driver unit 15 for driving saiddiaphragm. The diaphragm is preferably made of polystyrene foam sheet.The frame 6 is made of cast aluminum or pressed iron late or the likeand it includes a flange 6a and arms 6b integr ly formed therewith. Thedriver unit 15 IS supported by the arms 6b on the frame 6. The flangeportion 6a of the frame 6 is formed at its inner periphery in such shapeas to conform to the outer periphery of the diaphragm 7, and is formedat its outer periphery in such dimension and shape as to conform to theinside of a cabinet 8 to which the frame is to be mounted.

In the embodiment shown in FIGS. 3 and 4, a tweeter 9 is mounted in anopening 16 in the frame 6, and forms a two-way speaker system. i

The cabinet 8 has a rim 10 attached around the inside surface thereofand the loudspeaker 11 is mounted and fixed in the cabinet 8 by means ofscrews threaded into said rim 10 through holes 12 formed in the frame.

Thus, the flange portion 6a of the frame 6 serves as a baffle board likethe baffle board 5 shown in FIG. 2.

It will be understood that in accordance with the present invention itis not necessary to provide a baffle board in a cabinet, andconsequently the loudspeaker system can be manufactured economically.That is, the flange portion of the frame acts as a battle board, whichprevents the occurence of interference of sounds. Moreover, inaccordance with the present invention, a tweeter can be assembled on amain loudspeaker before it is mounted in a cabinet, and therefore thespeaker system can be easily manufactured. Also, a network can bepreviously assembled and wired on a loudspeaker before it is mounted ina cabinet, which simplifies and facilitates assemblage.

Iclaim:

1. A loudspeaker system including a speaker housing having a rectangularopening therein, a diaphragm, a driver unit for driving said diaphragm,a tweeter, and a metal frame for supporting said diaphragm, said driverunit, and said tweeter, and mounting them in said housing, said framehaving a metal flange portion of rectangular shape with a diaphragmopening therein the periphery of which is shaped to conform to the outerperiphery of the diaphragm, arms for supporting said driver unitintegrally formed on said flange portion about said diaphragm opening, atweeter opening in said flange portion between said diaphragm openingand the outer edge of the frame, and the outer periphery of said flangeportion having such dimensions to fit closely into said housing openingin which said frame is to be fixed to serve asa baffle board.

1. A loudspeaker system including a speaker housing having a rectangular opening therein, a diaphragm, a driver unit for driving said diaphragm, a tweeter, and a metal frame for supporting said diaphragm, said driver unit, and said tweeter, and mounting them in said housing, said frame having a metal flange portion of rectangular shape with a diaphragm opening therein the periphery of which is shaped to conform to the outer periphery of the diaphragm, arms for supporting said driver unit integrally formed on said flange portion about said diaphragm opening, a tweeter opening in said flange portion between said diaphragm opening and the outer edge of the frame, and the outer periphery of said flange portion having such dimensions to fit closely into said housing opening in which said frame is to be fixed to serve as a baffle board. 